Hygrothermograph



FIG. 1 is a first perspective view of a hygrothermograph showing the new design;

FIG. 2 is a second perspective view of the hygrothermograph showing the new design;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a right front side perspective view of the hygrothermograph in use; and,

FIG. 10 is a left rear perspective view of the hygrothermpgraph in use.

The broken lines in the drawings show portions of the hygrothermograph which form no part of the claimed design. 

CLAIM The ornamental design for a hygrothermograph, as shown and described. 